This is for a quantitative research study.
Depends on your Institution's Research Ethics policies. Usually its 5 years maximum.
maximum 5 years
I would put it in an archive in a fully documented form. I see no need for a time limit. For example:
https://www.data-archive.ac.uk/deposit/
and for qualitative
https://www.data-archive.ac.uk/managing-data/standards-and-procedures/persistent-identifiers/qualitative-data/
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